The Significance of Hippo Pathway Protein Expression in Oral Squamous Cell Carcinoma

Overview

Journal Front Med (Lausanne)

Specialty General Medicine

Date 2024 Mar 6

PMID 38444414

Authors

Yusuke Amano

Daisuke Matsubara

Atsushi Kihara

Taichiro Yoshimoto

Noriyoshi Fukushima

Hiroshi Nishino

Yoshiyuki Mori

Toshiro Niki

Affiliations

Soon will be listed here.

Abstract

Introduction: The Hippo pathway consists of mammalian sterile 20-like kinase 1/2 (MST1/2), large tumor suppressor 1/2 (LATS1/2), and yes-associated protein (YAP)1. Herein, we present the first report on the significance of major Hippo pathway protein expression in oral squamous cell carcinoma (OSCC).

Methods: The analyses included oral epithelial dysplasia (OED, = 7), carcinoma (CIS, = 14), and oral squamous cell carcinoma (OSCC, = 109).

Results: Cytoplasmic expression of MST1, LATS1, and LATS2 was low in OED, CIS, and OSCC. The cytoplasmic expression of MST2 was high in OED (5/7 cases), CIS (9/14 cases), and poorly differentiated OSCC (8/8 cases) but was low/lost in a proportion of differentiated OSCC (60/101 cases). The expression of YAP1 was associated with differentiation; low YAP expression was significantly more frequent in well-differentiated OSCC (35/71 cases), compared to moderately and poorly differentiated OSCC (11/38 cases). An infiltrative invasion pattern was associated with a high expression of MST2 and high expression of YAP1. The high expression of YAP1 was associated with features of epithelial-to-mesenchymal transition (EMT), such as the loss of E-cadherin and high expression of vimentin, laminin 5, and Slug. High expression of protein arginine methyltransferase (PRMT) 1 or 5, which positively regulates YAP activity, was associated with the high expression of YAP1 ( < 0.0001).

Conclusion: Among the major Hippo pathway proteins, MST2 displayed a distinctive expression pattern in a significant proportion of differentiated OSCC, suggesting a possible differential role for MST2 depending on the course of OSCC progression. A high YAP1 expression may indicate aggressive OSCC with EMT via PRMTs at the invasive front.

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